waterline /ˈwɔːtə(ɹ)laɪn/ noun6 •A line formed by the surface of the water on the hull of a ship when she is afloat; any of a series of short lines marked on the hull to show where the waterline would be under different loadings •A line showing where the water has been.Down here along the waterline, the Enterprise has a belt of thick antitorpedo armor. It's not too promising. — 1992 •The line formed by where the water level of a body of water currently is: where the water's surface currently meets the bank; it may move higher or lower depending on the weather, tide, or season. •The inner rim of the eyelid, just behind the lash line; primarily used in reference to the application of eyeliner. •A water pipeline. •A horizontal line indicating the shape of an airfoil. formswaterlines
